Ok, you’ve seen this before (probably,) but it’s still pretty cool. This is the WrathGate movie by Bliz.
You get to see this in-game by completing a series of quests in and around Dragonblight. This is instanced, so once it’s over the world looks a bit different, locally, anyway. Much like the Death Knight starter area.
Afterwards you need to go to Orgrimmar to help Thrall get even.
Great fun. I’m enjoying Wrath alot. Only 77 (Rogue) so far, but with limited play time, well, that’s not too bad.